J.R uk

Hey all i need some help as my ys 110 keep scorching the plugs (not blowing the plug) but the result is that i can have 2 or 3 flights then the motor wont hold a constent rpm it drops slowley, this is sorted by putting a freash plug in and it runs fine back to normal im useing os type f plugs and the fuel is 20 20 yamada mix does nyone know what the prob could be?

Dave Shadel

What size prop?

J.R uk

im useing a 15+8apc and a 16+6apc

Dave Shadel

Maybe you are just setting the engine too lean. Go to www.ysperformance.com and follow the running instructions.

J.R uk

i try to keep my motor a bit rich its not overly rich and is defentlyt not lean as its not getting hot and producing plenty of smoke its doing 9200rpm on the 16by 6 apc its is a new motor however its had about 6 or 7 gallons though it now! have you ever had this prob before?

J.R uk

A picture of my cowling and cooling holes its got one under cowl too!

Dave Shadel

Try flying it cowl off. I don't think the louvers will provide enough cooling. Has the engine done this since new?

J.R uk

No i had the motor in a g-trick 90 for a bit and had no probs the g-trick must have had better cooling so you reckon it might be getting to hot a and scorhing the plug? ill fly the f90 without the cowl on for a bit and see if it cures it, if so i no its a cooling prob thxs dave

Dave Shadel

Let me know.